From: Taehee Yoo <ap420073@gmail.com>
To: davem@davemloft.net, netdev@vger.kernel.org,
linux-wireless@vger.kernel.org, jakub.kicinski@netronome.com,
johannes@sipsolutions.net, j.vosburgh@gmail.com,
vfalico@gmail.com, andy@greyhouse.net, jiri@resnulli.us,
sd@queasysnail.net, roopa@cumulusnetworks.com,
saeedm@mellanox.com, manishc@marvell.com, rahulv@marvell.com,
kys@microsoft.com, haiyangz@microsoft.com,
stephen@networkplumber.org, sashal@kernel.org, hare@suse.de,
varun@chelsio.com, ubraun@linux.ibm.com, kgraul@linux.ibm.com,
jay.vosburgh@canonical.com, schuffelen@google.com, bjorn@mork.no
Cc: ap420073@gmail.com
Subject: [PATCH net v4 08/12] macsec: fix refcnt leak in module exit routine
Date: Sat, 28 Sep 2019 16:48:39 +0000 [thread overview]
Message-ID: <20190928164843.31800-9-ap420073@gmail.com> (raw)
In-Reply-To: <20190928164843.31800-1-ap420073@gmail.com>
When a macsec interface is created, it increases a refcnt to a lower
device(real device). when macsec interface is deleted, the refcnt is
decreased in macsec_free_netdev(), which is ->priv_destructor() of
macsec interface.
The problem scenario is this.
When nested macsec interfaces are exiting, the exit routine of the
macsec module makes refcnt leaks.
Test commands:
ip link add dummy0 type dummy
ip link add macsec0 link dummy0 type macsec
ip link add macsec1 link macsec0 type macsec
modprobe -rv macsec
[ 208.629433] unregister_netdevice: waiting for macsec0 to become free. Usage count = 1
Steps of exit routine of macsec module are below.
1. Calls ->dellink() in __rtnl_link_unregister().
2. Checks refcnt and wait refcnt to be 0 if refcnt is not 0 in
netdev_run_todo().
3. Calls ->priv_destruvtor() in netdev_run_todo().
Step2 checks refcnt, but step3 decreases refcnt.
So, step2 waits forever.
This patch makes the macsec module do not hold a refcnt of the lower
device because it already holds a refcnt of the lower device with
netdev_upper_dev_link().
Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
---
v1 -> v4 :
- This patch is not changed
drivers/net/macsec.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index c4a41b90c846..28972da4a0b3 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3032,12 +3032,10 @@ static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
static void macsec_free_netdev(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
- struct net_device *real_dev = macsec->real_dev;
free_percpu(macsec->stats);
free_percpu(macsec->secy.tx_sc.stats);
- dev_put(real_dev);
}
static void macsec_setup(struct net_device *dev)
@@ -3292,8 +3290,6 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
if (err < 0)
return err;
- dev_hold(real_dev);
-
macsec->nest_level = dev_get_nest_level(real_dev) + 1;
err = netdev_upper_dev_link(real_dev, dev, extack);
--
2.17.1
next prev parent reply other threads:[~2019-09-28 16:50 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-28 16:48 [PATCH net v4 00/12] net: fix nested device bugs Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 01/12] net: core: limit nested device depth Taehee Yoo
2019-09-28 19:36 ` Johannes Berg
2019-09-29 11:05 ` Taehee Yoo
2019-10-01 7:11 ` Johannes Berg
2019-10-01 13:53 ` Taehee Yoo
2019-10-01 13:57 ` Johannes Berg
2019-10-01 18:23 ` Taehee Yoo
2019-10-10 10:19 ` Sabrina Dubroca
2019-10-12 11:42 ` Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 02/12] vlan: use dynamic lockdep key instead of subclass Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 03/12] bonding: fix unexpected IFF_BONDING bit unset Taehee Yoo
2019-09-30 20:48 ` Jay Vosburgh
2019-09-28 16:48 ` [PATCH net v4 04/12] bonding: use dynamic lockdep key instead of subclass Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 05/12] team: use dynamic lockdep key instead of static key Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 06/12] macsec: use dynamic lockdep key instead of subclass Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 07/12] macvlan: " Taehee Yoo
2019-09-28 19:14 ` Johannes Berg
2019-09-29 8:03 ` Taehee Yoo
2019-10-01 7:25 ` Johannes Berg
2019-10-05 9:13 ` Taehee Yoo
2019-10-07 11:41 ` Johannes Berg
2019-10-08 8:13 ` Taehee Yoo
2019-10-21 16:00 ` Taehee Yoo
2019-09-28 16:48 ` Taehee Yoo [this message]
2019-09-28 16:48 ` [PATCH net v4 09/12] net: core: add ignore flag to netdev_adjacent structure Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 10/12] vxlan: add adjacent link to limit depth level Taehee Yoo
2019-09-28 16:48 ` [PATCH net v4 11/12] net: remove unnecessary variables and callback Taehee Yoo
2019-09-28 19:42 ` Johannes Berg
2019-09-28 16:48 ` [PATCH net v4 12/12] virt_wifi: fix refcnt leak in module exit routine Taehee Yoo
2019-09-28 18:57 ` Johannes Berg
2019-10-07 11:22 ` Sabrina Dubroca
2019-10-08 6:53 ` Taehee Yoo
2019-09-28 19:20 ` [PATCH net v4 00/12] net: fix nested device bugs Johannes Berg
2019-09-29 8:31 ` Taehee Yoo
2019-10-01 7:39 ` Johannes Berg
2019-10-05 9:40 ` Taehee Yoo
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